Add share controller

ShareViewcontroller.swift

//
//  TestViewController.swift
//  Balance
//
//  Created by ArashK on 2019-08-01.
//  Copyright © 2019 Congruent Tech. UG. All rights reserved.
//

import UIKit
import CloudKit
import CoreData

class MyShareController: UICloudSharingController {
    var onDisappear: (() -> ())? = nil
    
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        onDisappear?()
    }
}

class MyShareControllerWrapper: UIViewController {
    
    var vc: MyShareController? = nil
    
    @IBAction func onTapToClose(_ sender: Any) {
        self.dismiss(animated: true) {
            
        }
    }
    fileprivate func initShareController() {
        let vc = self.getShareController(share: self.share!)

        
        
        DispatchQueue.main.async { [weak self] in
            vc.onDisappear = { [weak vc] in
                vc?.view.removeFromSuperview()
                vc?.removeFromParent()
                self?.dismiss(animated: true) {}
            }

            self?.addChild(vc)
            self?.view.addSubview(vc.view)
            vc.view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
            vc.didMove(toParent: self)
            vc.view.setNeedsLayout()
        }
        
        self.vc = vc
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        initShareController()
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        
        if let valid = self.vc, vc?.parent == nil {
            valid.removeFromParent()
            valid.view.removeFromSuperview()
            initShareController()
        }
        
    }
    
    var share: CKShare? = nil
    
    func getShareController(share: CKShare) -> MyShareController {
        let result = MyShareController(share: share, container: CKContainer.default())
        result.availablePermissions = [.allowReadWrite]
        result.popoverPresentationController?.sourceView = self.view
        result.delegate = self
        return result
    }
}

extension MyShareControllerWrapper: UICloudSharingControllerDelegate {
    func cloudSharingController(_ csc: UICloudSharingController, failedToSaveShareWithError error: Error) {
        print(error.localizedDescription)
        
    }
    
    func itemTitle(for csc: UICloudSharingController) -> String? {
        return "OOOOItem title"
    }
}

This was helpful, thanks for sharing